<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button onclick="a.b().d()">点我</button>
    <script type="text/javascript">
        a = {
            b: function() {

                return {
                    data: {

                    },
                    c: function() {
                        console.log('123123');
                    },
                    d: function() {
                        this.c();
                    }
                }

            }
        };
        console.log(a)

        a.b().d();

        console.log(a)
    </script>


</body>

</html>